Studies On Characteristics Of Formation And Distribution Of Superfine Particulates From Coal-fired Boiler And Heavy Metal Contents In Them

China is the largest country that produces and consumes coal. And it is also a large country that consumes coal far more than other forms of energy, which will not change in the long future. Now we can conclude that, at present, the atmospheric pollution in China is soot-type pollution in all. Three pollutants, which are NOx, SO2 and TP are let out when coal is combusted, are the main pollution sources are tracked down all the time to carry studies on. Now with the requirement of high air quality, the previous researches cannot meet the new demands. For instance, in the aspect of grain size, China has listed the concentration of PM10 as one of the ten air quality standards in 1996. The studies on TP are not only concerned with the PM10's effecting the atmosphere, but also the composition of TP, its grain size and concentration doing harm to man are paid enough attention as well, namely, the PM10 and the heavy metals in it affecting man's respiratory system, lung function, blood circulating system and immune system function. What's more, the US EPA has set the regulation of PM2.5 in 1997. Now many a study has shown that, the pollutants from burning fossil fuel are one of the main air pollution sources. Therefore it's easy to draw the conclusion that, carrying studies on the regulatory of PM2.5's forming and harmful inorganic and organic trace elements' transforming and enriching in them while coal is burned are of great essence.The main contents of the dissertation include the following five aspects: firstly, exploring into the formation of fine fly ash from coal-fired boilers; Secondly, studies on the properties of composition of fly ash in the entrance and exit of the dust catcher of boilers by adopting WY-1 impact seven - stage classification dust sampler to sample fly ash; Thirdly, determination the contents of six harmful heavy metals - Pb, Cd, Cu, Zn, Ni and Cr - in the sampled classified fly ash by AAS (Atomic Absorption. Spectrometry); Fourthly, carrying out some preliminary researches on how the heavy metals in coal are transformed between the outcomes of coal-fired boilers, which are slag, fly ash and flue gas; And finally, doing some elementary studies on the leaching of fly ash by imposing TCLP (Toxicity Characteristics Leaching Procedure).